16.74. Path Expressions

Each sequencer must be configured to describe the areas or types of content that the sequencer is capable of handling. This is done by specifying these patterns using path expressions that identify the nodes (or node patterns) that should be sequenced and where to store the output generated by the sequencer. We'll see how to fully configure a sequencer in the next chapter, but before then let's dive into path expressions in more detail.

A path expression consist of two parts: a selection criteria (or an input path) and an output path:

  inputPath => outputPath 

The inputPath part defines an expression for the path of a node that is to be sequenced. Input paths consist of '/' separated segments, where each segment represents a pattern for a single node's name (including the same-name-sibling indexes) and '@' signifies a property name.